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For a hog barn, Hilborn says. the
obvious use would be for the
continuous -flow exhaust fans from a
manure pit. The main exhaust fans
from the barn itself would produce
too large a volume at too high a
pressure to be practical, he feels. If a
different filter material that can found
that still absorbs odours while letting
the air move more quickly through
the filter it would be more effective
for a hog barn, he says.
Still the system may not be
practical for hog barns at all, Hilborn
says because it's just too expensive.
There may be cheaper solutions
including venting exhaust through a
stack that would put the odorous air
higher and disperse it more widely.
creating an odour -free zone. Still. he
says, the best solution today is still
good setback distances.
No matter what, he says, there still
must be levels of tolerance, both
ways, between farmers and their
neighbours. The difficulty he says, is
determining what's a reasonable
level of tolerance.
If some of the new technologies
come into play, tolerance may be
easier to build.0
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Ontario Pork. From his
understanding, he says, the net result
of the composting operation is only
about six inches more material than
the two -foot depth that was put in the
pit in the first place.
Despite the fact manure spreading
would be cheaper, the biggest
detriment might be for farmers who
already have liquid manure
equipment in place and would have
to purchase a new system, Dietrich
says.
Caldwell says OMAFRA is
looking at the concept and Bradshaw
says Ontario Pork's environmental
committee is also interested.
Don
Hilborn, byproduct
management specialist with
OMAFRA's Woodstock
office, hopes there will be a smaller -
scale test of the technology in
Ontario so more can be learned.
Dietrich speculates there might be
an added incentive if Ontario
experience proves the barn as odour -
free as he experienced it in Ohio. It
might be possible to reduce the
minimum distance setbacks for such
barns, he says.
"For me it's the only way to go,"
Dietrich says of the technology.
Even if the new barns catch on,
there will still be many years left in
large livestock barns that already
exist and if they cause odour
complaints, what can be done?
Hilborn has been exploring the
area of biofilters to remove the odour
from air exhausted from barns.
The idea has already been proven
to work with an Oxford deadstock
company which installed a filter to
deal with odour issues. Smell the
unfiltered air and it's overpowering,
Hilborn says, but stand on top of the
filter and there's barely any smell at
all.
The filter bears a similarity to
high-rise hog barn solution. Exhaust
air is blown through pipes which are
installed in the bottom of a concrete
channel. The air comes out through
tiny holes in the concrete floor and is
filtered through a layer of peat or
woodchips about 18 to 24 inches
deep. As the air rises through the peat
the particles that carry the odour
attach themselves to the peat so that
when the air arrives at the surface of
the peat, the offensive odours have
been scrubbed.
APRIL 2000 37